Radial-drill column clamp



Feb; 2 1926.

D. C. KLAUSMEYER ET AL RADIAL DRILL COLUMN CLAMP Filed Sept. 15, 1922 ssheets-shut 1' I finventm @GA/bo C. M m

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Feb. 2 1926.

D. C. KLAUSMEYER ET AL RADIAL DRILL COLUMN 0mm 3 Sheets-Sheet 3 FiledSept. 15, 1922 c. NVENTORS M B &

n W i ATTORNEY point at its lowermost extremity.

Patented Feb. 2, 1926.

UNITED STATES PATENT OFFICE.

DAVID C. KLAUSMEYER AND ROWLAND L. RICKWOOD, O75 CINCINNATI, OHIO, AS-

SIGNORS TO THE CINCINNATI BICKFORD TOOL COMPANY, OF CINCINNATI, OHIO,

A CORPORATION OF OHIO.

RADIAL-DRILL COLUMN CLAMP.

Application filed September 15, 1922.

Z '0 all whom it may concern:

Be it known that we, DAVID C. KLAUs- MEYER and ROWLAND L. Rronwooo, eacha citizen of the United States, and residing at Cincinnati, in thecounty of Hamilton and State of Ohio, have invented a new and ImprovedRadial-Drill Column Clamp, of which the following specification is afull disclosure.

Our invention relates to precision machines, especially such as arerelatively massive and which normally operate under heavy strains andyet which must, for purposes of adjustment, admit of a free andcomparatively delicate manipulation. Machine-tools of the type known as:radialdrills may to advantage embody all or many of the characteristicsof this invention and a typical embodiment of that nature may well beresorted to by way of a full disclosure of this invention.

A radial-drill comprehends a vertical column from which horizontallyextends an arm on which, in turn, is supported a socall-ed drill-head inwhich is journaled the usual vertical spindle that carries the drill-These parts are heavy and, through the agency of the customarypower-driven elements, the drill-point is urged into the work under veryconsiderable pressure. In consequence, the arm-supporting column shouldbe capable of withstanding very severe bending strains. If notadequately constructed, the column will be caused to deflect or swayback, during the tooling operation, sufiiciently to disturb the initiallocation of the drillpoint and thus the accuracy of the work.

One of the difiiculties confronting the designer is that it is essentialto provide for an adjustment of the arm in a vertical direction alongthe column and also to provide a second adjustment whereby the arm maybe swung ina horizontal plane to bring the drill-point to variouslateral positions with respect to the work. This second adjustmentnecessitates an arrangement whereby the particular member (along whichthe arm is vertically movable) may be rotated about a vertical axis andultimately clamped against further movement. The aforesaid member isusually known as a column and it is frequently made tubular in form andmounted to turn about a vertical non-rotat- Serial No. 588,461.

able post which extends upwardly through the bore of the sleeve; the twobeing journaled together at appropriate points to preserveooncentrlcity.

Usually, the inner post and its circumscriblng sleeve admit of beingclamped together and it has heretofore been generally assumed that suchrigidity as exists may be attributed to the combined strength of thesetwo members considered as an integral entity. We have ascertained,however, that the ultimate rigidity is derived to a greater extent thanhas heretofore been appreciated from the sleeve itself and that thegreatest rigidity is attained by clamping the sleeve down upon a rigidplatform, rather than by resorting alone to the usual annular clampagainst an ordinary cylindrical portion of the post, and that the bestresults are derived from the cooperation of both species of clamps.

This joint invention, accordingly, undertakes so to form the post andthe sleeve, and

so to mount the latter on the former, that the two will be lockedtogether more effectively towards attaining a high degree of rigidityand yet, when released by appropriate means, to admit of easymanipulation for purposes of adjustment. In this invention, the sleeveduring the tooling-operation has its lower end resting flat-wise uponand clamped downwardly against a rigid platform (which may be a part ofthe post or of the base proper) and, simultaneously, the v upper end ofthe sleeve has a thrust-bearing operating under considerable pressureagainst the upper end of the fixed post; whereby at widely separatedpoints the sleeve has a firm support adequate to resist bending strains.In other words, the sleeve becomes virtually transformed into anauxiliary post which is locked to both the upper and the lower end ofthe main post; resulting in a dual-post of great rigidity. During theperiod of adjustment, however, the sleeve is merely freely suspendedfrom its upper end and none of its weight, or at least no great portionof its weight, is resting on the annular platform; with the result thatno undue frictional resistance must be overcome by the limited strengthof the operator when swinging the arm into a difierent position in itshorizontal plane.

Our joint invention will be better compre- .hended in detail byconsidering the prt 'lerred embodiment thereof depicted by the annexeddrawings, of which:

Fig. 1 is a side elevation of a radial drill embodying this invention.Fig. :2 is a side elevation, partly in rection. of the post. the sleeve,and the clamping means; the arm being omitted. Fin. 3 is a plan oi theclamping ring.

Fin. l is a horizontal section through the post: and sleeve along; theline -.la of Figs. 1 and Fig. 5 is a secondary detail ol' one side ofthe lower belllilte portion of the sleeve sl raving the means foradjusting the sleeve into close proximity with a cylindrical clampingsaur'lace provided by the lower portion of the post. lligtg. (i is afragmentary view. partly in elevation and partly in vertical section, ofthe lower end of the post and sleeve combining the clamp with a specialtriction reducer.

Referring to Fig. l, A. d Qfltttt; the post which is mounted rigidly tan appropriate base and B int'licates a sleeve waich. during); theperiod of adjustment. may be rotated about the post. A radial arm (7 isjournaled to the smooth exterior periphery of the sleeve so that it may,when nnclampedi 't'reely slide up and down thereon. i l. drill head I)slidably mounted on the extended portion of the arm so that it may beshifted toward and away from the column and a spindle E is carriedthereby. This spindle may be driven. as will be uudersiooch in anappropriate manner by suitable connections deriving power trout a mainelectric motor F mounted either on the base or. as shown. on a shortrearward ixtcnsion oi the arm C.

One ol. the incidental objects of this particular embodiment of thisinvention is to provide tor the raising: and lowering ot' the arm bypower derived, independently ol the main motor I :lrom a small auxiliarylllflt'll' G mounted at the upper end ot the sleeve and arranged torotate a liltinn screw in either direction to raise or low the arm. Thismotor controlled by a shall a which extends vertically along side ot thehub ll of the arm and which. is actu ted by a handle 5. The upper end ofthis t'l t operates a switch, c for controlling the electric motor G. Toprevent the user trom turninnon the lifting power when the arm (l isclamped (by means of the clamps l5. K) the lovers is, 7.3 have aninterlocking relation with squared shaft" a in the manner set forth inthe patent to Klausmeycr. No. Lil-0.5108.

Referring to Fig. 2, the post A terminates at;- its lowermost end in aportion 1 having a flange 2 which. by means ot appropriate bolts 3., maybe secured rigidly to the base proper. The portion 1 may be surmountedby a sonuwvhat reduced annular portion l and the latter a suitablepoint. provides an annular l ti'orm 'l he upper horizontal marginalportion ti at this llangre constitutes an annular seat or shoulderadapted to receive the weight 01 the sleeve when the latter is forceddown upon it: by the clamping agent soon to be described.

This post A is tubular in term and it extends upwardly and terminatesadjacent the upper extremity of a sleeve B which circumscrilies it. Thispost essentially serves the purpose of a lonefixed pivot for the sleevewhich essentially so mounted as to admit. of being: suspended from itsupper end. in a construction of this nature. there are three distincttunctioi'is to be attained. l irst. the sleeve must be maintainedaccurately in co-axial relation with the post inns 11inch the'llundtuncntal precision of the marl-tine depends upon the perfectpreservation of this relation. Second, the weightot the sleeve(supplemented by that of the arm, etc.) must be so freely carried that,during the period of adjustment, the user can with ease move theponderous parts. 'lhird. during the tooling-operation, the sleeve mustbe clamped lirmly in the co-axial relation (accurately determined asatore slid) so that it will be capable of withstanding); for whateverstrains are imposed upon it by the tooling-operation. This clampingshould primarily etl'ect a very solid resting it the sleeve on its endso that it will virtually become an imlependent auxiliary post capableof nost ctli'ectivcly resistingeven the slightest tendency to overturnabout its lower end or in any manner to shift its position relative tothe stationary central post and, pre'litu'abl v also, it should likewisebe clamped around the post to assist further in maintaining its relationto the post. the manner in which these severa functions are obtained bythis invention will be explained.

The co-axality between the sleeve and the post is accurately insiuicd bya smooth trulyt. 'lindrieal loaver-binning it provided by the post and aroller hearing it interposed between the upper end of the post and theupper end ol the sleeve. The suspension of the sleeve is obtained by athrust-beariup; :38 seated upon a shoulder 17 provided by the upper end'l-lof the post; said thrust bearing being; adapted to carry the weight:of the sleeve as will be presently described. The solid positive seatingoi the sleeve is attained by a bearing tiagainst which the sleeve isdepressed and to which it is securely clamped. This bearing also tendsto serve the purpose of restraining: the sleeve against rotation aboutthe post but prel'erably, this function is assisted by an extensivecylindrical surface 9 in the nature of a brake or friction surfacen'ovided by the post; the sleeve being split and adapted. b" a slightcontractioiu to be clamped around the same.

it is not dcsi'able to have the sleeve rest.

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heavily at all times on the platform 6, since it would then be verydifficult for the user to swing the arm and sleeve for purposes ofadjustment by reason of excessive friction. Accordingly, this inventioncontemplates means for enabling the bearing 6 to be relieved ofexcessive loads preparatory to make an adjustment. In other words,during such periods, the entire weight, or substantially so, of thesleeve is caused to be carried by an anti'friction thrust-bearing as ofthe roller type which reduces the friction to a minimum. A simple andeffective way of accomplishing that purpose is to interpose a resilientinstrun'ientality between the thrustroller bearing 28 and either thepost A or the sleeve B. Preferably, this resilient instrumcntalityassumes the form of a flexible diaphragm 29 which is sufliciently stiifto carry substantially the full weight of the arm and yet which permitsthe arm to be depressed very slightly under the pressure exerted by anappropriate clamp until it is brought into a firm seating relation withthe platform 6. It will be understood that this movement need only bevery slight; it being only necessary to lift the sleeve barely enough torelieve its actual pressure against the platform 6 in order to free itfully for purposes of adjustment.

A very simple and du able flexible diaphragm admirably suitable for thepurpose is one formed as an integral part of a ring or cap B which maybe made of steel or other suitable material and be permanently aflixedto the upper end of the sleeve. For example, the cap B is shown toconsist of an annular rim-like portion having a flange 30 which overlapsand circumscribes the upper end of the sleeve and is securely afiixedthereto. A flange-like portion 29 radiates inwardly from the'innerperiphery of the cap B and is preferably dished to give it a greaterdegree of resiliency. This dished diaphragm 29 has a hub 32 which isprovided with screw-threads 33 receiving a nut 34 which, in turn,presses directly against the thrust-bearing 28. lVhen the machine isbeing assembled, the nut 34 is adjusted by means of a spanner-wrenchengaging notches 35 in its periphery; the adjustment being carriedto thepoint of insuring that the sleeve will not make undue contact with theplatform 6 when the clamps are released.

The clamping agent M isv shown by Fig. 3 and preferably has the form ofa split ring comprising sections such as m and m. This split ring has aninterval V-shaped groove 36 adapted to engage conversely flaring coni-.al shoulders 7 and 37 provided by the sleeves and the platform 5,respectively. It is important to note that the chief function of thissplit-ring is to compel a depression of the sleeve, i. e., to force amovement of said sleeve in a vertical direction to close the gap betweenthe platform 6 and the abutment of the sleeve and cause these parts topress together endwise so firmly as to lock them together at the point6. Incidentally, it may also accomplish a suflicient contraction of thesplit clamping portion 38 of the sleeve to prevent any turning of thesleeve about the post, as will soon be described.

Since the primary function of the splitring is to effect a movement in avertical direction of the sleeve, under considerable pressure it isimportant that the angle subtended by the conical surface 37 shall besuch that the vertical component of the pressure exerted by thesplit-ring shall be materially greater than the horizontal componentand, therefore, the angle to the horizontal contemplated by thisinvention is in the neighborhood of Such an angle will enable a greatforce to be brought in a vertical direction and a materially smallerforce in horizontal direction; the latter being however adequate toeffect a constriction of the split portion 38 of the sleeve around thebrake drum or cylindrical clamping surface 9.

From a structural standpoint, the internal V-shaped groove, provided bythe split-ring is discontinuous; being composed of sectors 39 to 44.This enables the pressures to be exerted radially at diametricallyopposite points and insures a uniform action to compensate for anypossible irregular deformations of the clamping-ring. The twosemiannular portions m and m are held together by means of two bolts and46. The head of bolt 45 preferably has a hemi spherical face 47 seatedin a corresponding recess in the section m and a similarly formed nut 48is likewise adjustably arranged at its other end. This constructionprovides a desirable hinge-like action. Bolt 46 is a part of a clampingdevice and preferably is in the nature of an eye-bolt; and an ordinaryeccentric pin 49 passes through the eye 50 of said bolt to enable thering sections to be drawn together. The pin 49 is journaled at its upperend to an apertured lug 51 and is likewise journaled at its lower end toa similar lug 52 and this pin may be turned by means of a hand-lever IIattached to the shaft 49. In the modification shown by Fig. 1, the shaft49 is, by means of a coupling 53 attached to the lower end of a splinedshaft 54 which extends upwardly in parallelism with the column and isjournaled at its upper end to a lug 55 provided by the cap B. Thepurpose of this is to enable the column to be clamped against rotationby a hand. lever J located at all times within the immediate reach ofthe user, i. e., on the drill-head D. To this end, a splined-shaft 56 ishorizontally journaled on the arm at points 57 and 5S and an operutiveconnection between t the vertical slut'l't o-t its eehihi gears 59 whichure likewise part travelling with the arm. d 'nW-holt lit to hendjueted, u nut (it is secured on its end.

he ul The portion 38 of the Sleeve uplit rertiicu ly {It one wide :isIilUiCtii'Gll l v T on Fig. I; and u hint iii ennhles the uter so toadjust the te on of the split portion that, when the split-ring): Illis; contracted to sent the sleeve .aei cl on the platform, it willeimuliuneousl;v clamp the eleeve to the c vlinl reterzil l n driculportion 5 he poet.

:1 duet-gun rd tjzi' nuturc oi an annular ring or it {hinge \rilleircuunaerile the upper end oi the split-ring; and therein prevent chipsor dirt trom e'ettil into the eontiieting eurtucer; and impelriue th iruccuremv l\ oi. operation. ill? in to he not d thut tl c t, split-ringis located externally and is (it till tunes :tttttiitllilt to the ueerof the Jiltllliae and that it therefore ml or or hiring; very: eueiljvdisuse unhled end re 'ilziccd :rtter heinp cleaned it otherwiserepaired.

It is desirable thut the elumpine-lever i should preserve its lo *utiourelative to the sleeve it end to the 'ndiztl-nrni so that the user willnot he put to the nect tj of Working :1 lever located inlll'ltlCtfilatUlllitl relutiem. 'lhio ohjeet inuji', ct counae ireettziined in diverse Wave; hut it M111)" he very simply achieved h v1)lt)\'itil1i}1 on Q1 gement heuveen the ring); M and the *YlLLVQ intoiorcc applied the 1 Will hence ulive ciz tind the lunulle in the built-Irelation to the vertical plane ot the arm tuut he has heroine'izuuilizu' with.

'ihit; clunn'iin r conetructicu is not only of advent-irate insmell-sized machines hut tlliiit) in rudiul drills ot' the more ponderou'e t vpe. lit hue heen found in pru t icc, to he exceedingly; rigid:intl nceurute when set or locked while yet zidmittini oi thus loclzedh}; the mere epphe .1 ()t na'ry llltltliitl power. l leretzitmt to e inrpe e ot' lt)t'lil1. 5.1' the clump in hurry-duty radioldrills. it hasbeen quite ditlicult to do PM etiectively hy un :ipplicution oi? the itsat rennth oi tin att ndant zinih therei'cre, eucn hirgzje nuehineshzive luihinulh: euihodi l u'ieun: :t'or utilizing pmver tor theP1111101 ot setting); the clump. l or erzmnple uttempts have been madeto overcome this diff struction 1112!) with equal facility, he resortedto either in that type of rudiul drill in which the arm 'UXL'QIILLAintegrully from the sleeve and which, therettu'e, admits of being ewung:around ii verti ul pivot rith the sleeve hut does not provide for anyvertical adjustmentrehitive to the ulcere, or the clumping mechanisminuy he applied to the more uuii'ersatl tjvpe oi? rndizil drill such,for crtuuu ile 11):? that indicnted hy the drawing-5.

As shown hy Fig. 2 the elevation of the urzu may he eti'ected hy powerderived from the hose oi the nntchine in the nuinner conventionallyresorted to when the motor is loeuted on the lJttL-Ei. lln that form, ahorizontnl shaft (323 enters the base through a side aperture andconnected, by menus oi lzcvel-grez r1; til, Esit) in; to derive motionfrom it verti ill sluil't e5 passing;- through the or; it the post; euidelnrlt heing 'ournuled zit it.-; lower end in u heuring it) carried hythe values: ll and at its upper end in ii hushiug: tit lining; the hereoi ii hearing 15 provided by the upper end of the post. Ineons-rtrnctions heretofore used, the hearing for the upper end of thisslnrtt has heen provided hr at cup-nieniher ellixed to the upper end ofthe sleeve hut. in those previous eone'ructionz-h there existed attendency ifor the norunil friction thetiuecn the rotating); nhzrtt endthe cup) to swing; the 21 rm; which ohiect'ion in. by the prerientconstruction, entirely ohviuted. 111 other words" the shaft 5 isjourneled only on solid immovuhle portions of the tixed poet ft. Thisshe-ti ($5 is t-nn'niountcd by a gear ti! which likewise rests upon itstutionnry hearing; it.) formed hy the extreme upper end ot' the post.From the tear (37, motion is ohtriined and is utilized thrt'iunhcouventiijmzil instrumentulities for e ther driving the spindle or torraising or lowering the iii-n1. 'lheue parts heiup eonventionnl need nothe decrihe lt "lo Still further int-reuse the smoothness of notion ofthe sleere when the clump is releueei'l, the construction nniy includein comhim tion the nrrnugteiueut disclosed in the ctr-pending! :ippli:iitionoi D. Kluusn'ieyer lilo lt dtifiil, tiled lune 199i, and entitled"firm mount with :tctQFSliJlG gear unit; in which cure. thelllOt'llttHlt-lil may to advantage he built in accordance with Fig. 6.The

clamping surface 9 is, in this case, shown sufficiently larger indiameter than the bearing surface 11 to provide room for an adjustablebearing and, intervening between the clamp-surface 9 and bearing 11, islocated an annular runway 80 which is preferably formed of a hardenedsteel ring 81 shrunk onto an annular seat 82 provided by the post. Thesleeve 13 is formed as indicated by 83 and its interior annular surfaceis provided with a small hub 84 havingavertical hole 85 in which isseated a stud 86 terminating at its lowerend in an eccentrically locatedportion 87 which carries a ball-bearing 88 which functions as a rollerriding on the periphery 80 of the hardened ring 81. The end of the studis headed, as indicated by 89, to keep the ball-bearing in place and alock-screw 90 serves to hold the stud in place and prevent it fromrotating. By releasing the lock-screw 90 and by applying a wrench to asquared socket 91 in the upper end of the stud 86, the latter may beturned sufficiently to cause the ballbearing 88 to press laterallyagainst the bearing 80 with sufIicient force to compensate largely orwholly for the lateral thrust set up against the bearing-surface 11 as aresult of the deflection of the sleeve under the turning-moment of thearm which radially extends therefrom in the vertical plane of thepressure-relieving device above explained. It is to be understood thatthis pressure-relieving device is not'relied .upon as a main-bearing forthe sleeve but fundamentally for the purpose of sufficiently relievingthe friction of the main-bearings so that, when the clamp M isreleased,the user of the machine can swing the ponderous sleeve and itsmassive radial arm about a horizontal arc with ease and facility. It isalso to be noted that, in this case, the pressure-relieving device is soconstructed that it will not interfere in any way with the slightup-and-down shifting of the sleeve caused by an operation of the clampring M,

i. e. the roller 88 may slide vertically on its track 81 since theperiphery 80. of the latter is truly cylindrical and has no shouldersand no such taper as would prevent an upward shift of the roller 88.

Without further analysis, the foregoing will so fully reveal the gist ofthis invention that others can, by applying current knowledge, readilyadapt it for various utilizations by retaining one or more of theessential characteristics of either the generic or specific aspects ofthis invention, and, therefore, such adaptations should be, and areintended to be, comprehended within the meaning and range of equivalencyof the following claims.

Having thus revealed this invention, we claim as new and desire tosecure the following combinations and elements, or

equivalents thereof, by Letters Patent of the United States: I

1. A mechanism of the nature disclosed combining a tubular member; anupright post extending through the bore of said tubular member andterminating adjacent the uppermost end thereof; a thrust-bearingintervening between the uppermost ends of.

said member and of said post; resilient means interposed between saidthrust-bearing and one of said parts whereby a large portion of theweight of said tubular member may be carried by said thrust-bearing;said post being provided adjacent its lowermost end with an annularplatform and said tubular member having an annular seat arranged inimmediate proximity with said platform, said platform and said seatbeing in the nature of weight-supporting surfaces; and clamping meansfor depressing said tubular member firmly to said platform against theyielding opposition of said resilient means.

2. A mechanism of the nature disclosed combining a base and anon-rotatable post upstanding thereon; a tubular member suspended fromthe upper end of said post and having its lower portion circumscribingsaid post, said lower portion and the adjacent portion of said basebeing provided with co-acting bearing-surfaces located in asubstantially horizontal plane; means for permitting a limiteddepression of said suspended tubular member; and a clamping devicecooperating with said means for establishing a positive contact betweenthe aforesaid bearing surfaces.

3. A mechanism of the nature disclosed combining an outer tubularmember; a post substantially co-extensive in length with said member andextending upwardly through the bore thereof; a yielding thrustbearinginterposed between the upper ends of said post and member; said post andmember having co-acting bearing surfaces adjacent their lower ends; andclamping means for positively depressing said member to establish a firmcontact between said lower bearing surfaces.

4. A mechanism of the nature disclosed combining an upright post havingadjacent its lower end a cylindrical bearing surface and also atransverse annular seating surface; a sleeve resiliently suspended fromthe upper portion of said post and having an enlarged lower endcircumscribing said cylindrical surface and having another beararesilient diaphragm interposed between said thrust-bearing and one ofsaid parts; an adjustable device between said diaphragm and saidthrust-bearing adapted to regulate the normal position of saidtubularmembe'; said post being provided adjacent its lowermost end withan annular platform and said tubular member having an annular seatingsurface arranged in immediate proximity with said platform; and clampingmeans for depressing said tubular member firmly against said platformagainst the yielding opposition of said diaphragm.

16. A mechanism of the nature disclosed combining a base and anon-rotatable post upstanding thereon; a tubular member suspended fromthe upper end of said post and having its lower portion circumscribingsaid post, said lower portion and the adjacent portion of said basebeing provided with co-acting bearing-surfaces located in asubstantially horizontal plane; an adjustable diaphragm for permitting alimited resilient depression of said suspended tubular member; and aclamping device operative against said diaphragm for establishing apositive contact between the aforesaid bearing surfaces.

17 A mechanism of the nature disclosed combining an outer tubularmember; a post co-extensive in length with said member and extendingupwardly through the bore thereof; a thrust-bearing interposed betweenthe upper ends of said post and member; an adjustable resilient meansbetween said thrust-bearing and said tubular-member; said post andmember having co-acting bearing surfaces adjacent their lower ends; andclamping means for positively depressing said member to establish a firmcontact between said lower bearing surfaces.

18. A mechanism of the nature disclosed combining an upright post havingadjacentits lower end a cylindrical bearing surface and also atransverse annular seating surface; a sleeve resiliently suspended fromthe upper portion of said post and having an enlarged lower endcircumscriblng said cylindrical surface and having another bearingsurface adjacent said seating surface; means for adjusting the normalposition of suspension of said; sleeve; means for depressing said sleeveto establish contact between said seating surfaces; and means toestablish a clamping relation between said cylindrical vsurfaces. A

19. A mechanism of the nature disclosed combining an internal post; asleeve; adjustable means for resiliently suspending it from an upperportion of said post, said sleeve circumscribing the major portion ofsaid post and the lower portion of said sleeve and an adjacent portionof said post having annular conical flanges. providing substantiallyco-planar contact-surfaces; and

means having an interior V-shaped groove adapted to cooperate with theconical portions of said two flanges to establish a firm seating of saidsleeve against the lower portion of said post.

20. A. post for radial drills consisting of a single casting in thenature of a tube, the lower end of said post being flared and the upperportion of said post having a cylindrical periphery and having its innerperiphery provided with a. multiplicity of downwardly extending ribs inthe nature of corrugations; a shaft-bearing supported by certain of saidribs the upper end of said post being formed with a reduced cylindricalportion formed with a central bore adapted to support a shaft-bearing; ahorizontally disposed sleeve-supporting shoulder extending outwardlyfrom said reduced portion and adjacent its lower end and terminating ina vertically disposed sleeve-locating bearing surface.

21. A post for radial drills comprehending a tube having its upperportion of substantially uniform diameter and its lower portion enlargedthe upper interior portion of said post being corrugated and the lowerinterior portion being provided with vanes radiating inwardly toward thecenter the upper end of said post providing concentric bearing surfacesand at its lower end having a bearing to which said vanes are integrallyconnected.

22. A radial drill combining a post and a sleeve circumscribing saidpost; five bearings interposed between said post and sleeve, theuppermost and the lowermost bearing being adapted to sustain the weightof said sleeve, two of the remaining bearings serving to centralize thesleeve on said post, the.

one bearing being near its upper end and the other near its lower end,and the remaining bearing being in the nature of a cylindrical clampingsurface; and a shaft extending through the bore of said post andjournaled thereto at its upper and lower ends.

23. A radial drill combining an upright sleeve having a radial armextending horizontally therefrom; a supporting column for said sleeve;means intermediate the column and sleeve; adapted to permit a slightdepression of the sleeve; a drill-head shiftable horizontally along saidradial arm; an operating lever mounted to be shifted into a positionadjacent said drill head; clampingmeans for depressing said sleeve; andcon nections extending from said clampingmeans to said lever whereby thelatter wherever located may be employed to actuate said clamping-means.

9A. A radial drill combining a post and a sleeve circumscribing saidpost; said sleeve and said post providing flanges presenting endwiseabutment surfaces and also con- \ersely disposed coni nl surfaces; :1clumpin; ring curried by und n'inmblu with said slume and cooperatingwith suid cnnic: 1 surlutun. snid ring having an ongngonmnt For keeping:it from shitting about said sloevv: and a lever for constricting saidring.

A i'udinl drill C()llllJil1iH Q'tl posthaving :1 cylindri fll clumpingsur'fnce; u sleeve circuinsci'ibing said post and having :1 splitportion uround said cylindrical (*lan'ipii'lg' surface, said slcevv andsaid post nlso having: eudwisn ulnitnient sui'tnccs; :1 wedgnlikeannulus adapted for lateral movement and having its acting SUI'iZICQinclined at an nngg'ln 11; Event portion of said SlOOVO laterally and 1ly. suid annulus lining intui'loulcml to id sleeve 10 pim 'nut it fromshifting n and mid Sleeve; and. menus mounted in l unnulus.

adapted -ziiunltununusly to move the l lixul i'olutinn to said sleevefor constricting 20

